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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Compensation expense included in the Company’s consolidated statements of income (loss) for all share-based compensation arrangements was as follows for the periods ended December 31, 2020, 2019 and 2018, respectively:
Share-based Compensation Expense:202020192018
Research and development $139 $429 $880 
Selling, general and administrative 3,281 2,154 6,972 
Restructuring costs(421)(2,064)— 
Total share-based compensation expense$2,999 $519 $7,852 
Schedule of Share Based Payment Award Stock Options and Warrant Grants Valuation Assumptions
The weighted-average assumptions under the Black-Scholes option-pricing model for stock option grants as of December 31, 2020, 2019 and 2018, are as follows:   
Stock Option Assumptions: 202020192018
Stock option grants:   
Expected term (years)6.086.256.25
Expected volatility75.76 %56.48 %56.59 %
Risk-free interest rate0.72 %2.52 %2.68 %
Expected dividend yield— — — 
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the combined stock option activity and other data for the Company’s stock option plans for the year ended December 31, 2020 is as follows:   
 Stock Option Activity and Other Data: Number of Stock
Options		Weighted Average
Exercise Price per Share		Weighted Average
Remaining
Contractual Life		Aggregate
Intrinsic Value
Stock options outstanding, January 1, 2020
5,121 $7.51   
Granted2,551 6.90   
Exercised(403)5.08   
Forfeited(566)3.24   
Expired(805)13.37 
Stock options outstanding, December 31, 2020
5,898 $7.02 7.96 years$7,115 
Stock options exercisable, December 31, 2020
2,172 $9.48 5.58 years$1,841 
Schedule of Stockholders' Equity Note, Warrants or Rights
A summary of the combined warrant activity and other data for the year ended December 31, 2020 is as follows:   
 Warrant Activity and Other Data: Number of
Warrants		Weighted Average Exercise Price per ShareWeighted Average Remaining
Contractual Life		Aggregate Intrinsic
Value
Warrants outstanding, January 1, 2020
291 $13.59   
Granted— —   
Exercised— —   
Forfeited— —   
Expired(291)13.59 
Warrants outstanding, December 31, 2020
— $— 0.00 years$— 
Warrants exercisable, December 31, 2020
— $— 0.00 years$— 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
A summary of the Company’s restricted share awards as of December 31, 2020, and changes during the year then ended, is reflected in the table below. 
Restricted Share Activity and Other Data: Number of Restricted Share AwardsWeighted Average Grant Date
Fair Value
Non-vested restricted share awards outstanding, January 1, 2020
347 $4.73 
Granted186 7.69 
Vested(115)6.01 
Forfeited(71)4.83 
Non-vested restricted share awards outstanding, December 31, 2020
347 $5.87 
A summary of the Company’s performance share units awards as of December 31, 2020, and changes during the year then ended, is reflected in the table below.
Performance Unit Share Activity and Other DataNumber of Performance Share AwardsWeighted Average Grant Date
Fair Value
Non-vested performance share awards outstanding, January 1, 2020— $— 
Granted257 7.09 
Vested— — 
Forfeited— — 
Non-vested performance share awards outstanding, December 31, 2020257 $7.09