Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands										12 Months Ended
	Feb. 13, 2020	Feb. 01, 2020	Jan. 06, 2020	Sep. 06, 2019	Jul. 31, 2019	Aug. 08, 2018	May 31, 2018	Jun. 05, 2017	Sep. 20, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional awards to be granted under the plan (in shares)											0
Shares available for future issuance (in shares)										388,463	699,376	1,023,378
Reclassification from other long-term liabilities to additional paid-in capital					$ 366					$ 366	$ 0
Number of options granted to employees (in shares)										658,030	727,257
Stock options, exercise price at grant date (in USD per share)										$ 2.36	$ 2.97
Share-based compensation expense										$ 1,838	$ 2,204
Total intrinsic value of options exercised										15	95
Total unrecognized compensation expense related to non-vested share based compensation										$ 965	$ 1,036
Weighted average period for nonvested share recognition										11 months 27 days	1 year 9 months 15 days
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional awards to be granted under the plan (in shares)		1,000,000
Fair value per share of common stock underlying the instrument (in USD per share)		$ 0.52
CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employment agreement, number of SARs granted on a contingent basis (in shares)						1,000,000
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in USD per share)					$ 3.8	$ 3.8					$ 3.8
Employee share-based compensation expense										$ 507	$ 8
Unrecognized compensation expense related to non-vested SARs										$ 33
Fair value per share of common stock underlying the instrument (in USD per share)					$ 2.66						$ 0.83
SARs | Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employment agreement, number of SARs granted on a contingent basis (in shares)			600,000
Exercise price (in USD per share)			$ 0.82
2008 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)													1,416,666
Additional awards to be granted under the plan (in shares)									0
Stock options expiration period										10 years
2016 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)									833,333
Additional awards to be granted under the plan (in shares)					1,000,000			1,200,000
Maximum aggregate shares to be awarded to one person (in shares)					1,000,000				250,000
Shares available for future issuance (in shares)										388,463
Stock options expiration period										10 years
2016 Stock Plan | Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted to employees (in shares)	383,000
Inducement Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in USD per share)				$ 2.62
Number of options granted to employees (in shares)				25,000			100,500
Stock options, exercise price at grant date (in USD per share)							$ 3.15
Stock options vesting period										3 years