Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plan (Narrative) (Details)

Stock-Based Compensation Plan (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item $ / shares shares	Jun. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock that may be granted through awards to any employee in any calendar year			500
Number of stock options issued under a plan			500,000
Vesting period per share price qualification \| $ / shares			$ 15.00
Stock options granted fair value \| $			$ 952
Allocated Share-based Compensation Expense \| $	$ 783	$ 656	1,568	$ 1,155
Unrecognized compensation cost related to unvested stock options \| $	$ 5,082		$ 5,082
Unvested restricted stock awards	600		600
Unvested stock options	1,695		1,695
Unrecognized compensation cost related to unvested restricted stock awards \| $	$ 3,529		$ 3,529
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the restricted stock awards granted \| $			$ 3,962
2015 Plan [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options issued under a plan			188,000
2015 Plan [Member] \| Restricted Stock \| Employee One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options issued under a plan			350,000
Shares vesting, first installment	117,000		117,000
Shares vesting, second installment	117,000		117,000
Shares vesting, third installment	117,000		117,000
Shares vesting, forth installment	116,000		116,000
Threshold share price \| $ / shares	$ 15.00		$ 15.00
Threshold share price period for vesting condition			20 days
2015 Plan [Member] \| Restricted Stock \| Employee Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options issued under a plan			150,000
Threshold share price \| $ / shares	$ 15.00		$ 15.00
Threshold share price period for vesting condition			20 days
Minimum [Member] \| 2015 Plan [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Maximum [Member] \| 2015 Plan [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Vest In Four Equal Consecutive Quarterly Tranches From The Date Of Grant [Member] \| 2015 Plan [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Vesting Tranches \| item			4
Shares vesting, first installment	38,000		38,000
Vesting In Three Installments [Member] \| 2015 Plan [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Vesting Tranches \| item			3
Shares vesting, second installment	150,000		150,000