Stock-Based Compensation - Restricted Stock Unit Grants (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Dividend Share-based Payment Arrangement
Cash paid for withholding taxes	$ 223
RSU's
Dividend Share-based Payment Arrangement
Shares Paid for Tax Withholding for Share Based Compensation	194,010
Cash paid for withholding taxes	$ 200
RSU's \| 2018 Plan
Number of Shares
Balance at the beginning of the period (in shares)	893,297
Shares granted	268,607
Shares forfeited	(151,067)
Shares vested	(610,482)
Balance at the end of the period (in shares)	400,355	893,297
Weighted Average Grant Date Fair Value
Balance at the beginning of the period	$ 5.86
Balance at the end of the period	$ 2.12	$ 5.86
Average Remaining Contractual Life (Years)
Weighted average remaining contractual life (in years)	1 year 5 months 5 days	9 months 4 days
Aggregate Intrinsic Value
Aggregate intrinsic value outstanding	$ 849	$ 5,239
RSU's \| 2018 Plan \| Minimum
Stock-Based Compensation
Vesting period	1 year
RSU's \| 2018 Plan \| Maximum
Stock-Based Compensation
Vesting period	2 years

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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