Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plan (Narrative) (Details)

Stock-Based Compensation Plan (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) item $ / shares shares	Sep. 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
Vesting period per share price qualification \| $ / shares			$ 15.00
Stock options granted fair value \| $			$ 952
Allocated Share-based Compensation Expense \| $	$ 678	$ 912	2,246	$ 2,067
Unrecognized compensation cost related to unvested stock options \| $	$ 4,587		$ 4,587
Unvested restricted stock awards	600		600
Unvested stock options	1,685		1,685
Unrecognized compensation cost related to unvested restricted stock awards \| $	$ 3,136		$ 3,136
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
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
Shares vesting, first installment	117		117
Shares vesting, second installment	117		117
Shares vesting, third installment	117		117
Shares vesting, forth installment	116		116
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
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		38
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		150