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Equity Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Components of Share-based Compensation Expense The following table sets forth the components of the Company’s share-based compensation expense for the three and six month periods ended June 30, 2020 and 2019 (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Stock options$777  $1,440  $1,602  $2,821  
Employee stock purchase plan—  269  —  498  
Restricted stock units and Performance share units3,570  3,879  6,176  6,989  
Total stock-based compensation expense$4,347  $5,588  $7,778  $10,308  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Set forth in the following table are the weighted-average assumptions used in estimating the grant date fair value of the stock options granted under the
Company's equity compensation plans during the three and six month periods ended June 30, 2020 and 2019, respectively, along with the weighted-average grant date fair values:

Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Expected volatility— %52 %59.96 %57 %
Expected life (in years)0.06.26.36.2
Risk-free interest rate— %2.3 %0.96 %2.4 %
Dividend yield—  —  —  —  
Weighted-average grant date fair value per stock option$—  $2.34  $0.59  $2.37  
Forfeiture rate— %8.0 %8 %8 %
Schedule of Share-based Compensation, Activity
The table below sets forth a summary of stock option activity within the Company’s stock-based compensation plans for the six month period ended June 30, 2020:

Number of
Options
(in thousands)		Weighted
Average
Exercise Price		Weighted
Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic Value
(in thousands) (1)
Outstanding at December 31, 20195,204  $14.33  6.8$—  
Granted85  1.05    
Exercised—  —    
Forfeited(367) 17.41    
Outstanding at June 30, 20204,922  $13.87  6.5$—  
Exercisable at June 30, 20202,413  $22.90  4.4$—  

(1) The Aggregate Intrinsic Value of stock options outstanding and exercisable is defined as the difference between the market value of the Company’s common stock as of the date indicated and the exercise price of the stock options. There were no in-the-money options as of June 30, 2020. Stock options for which the exercise price exceeded the market price have been omitted. Fluctuations in the intrinsic value of both outstanding and exercisable options may result from changes in underlying stock price and the timing and volume of option grants, exercises and forfeitures.
Schedule of Nonvested Restricted Stock Units Activity
Set forth below is a summary of unvested RSU activity during the six month period ended June 30, 2020:

Number of Units
(in thousands)		Weighted Average Per Share
Grant Date Fair Value
Unvested at December 31, 20195,074  $7.07  
Granted48  $1.05  
Vested(688) $11.70  
Forfeited(249) $8.92  
Unvested at June 30, 20204,185  $6.13  
Schedule of Nonvested Performance-based Units Activity
Set forth below is a summary of unvested PSU activity during the six month period ended June 30, 2020:

Total Number of Units
(in thousands)		Weighted Average Grant Date Fair Value per UnitVesting Based on Performance ConditionsWeighted Average Grant Date Fair Value per UnitVesting Based on Market ConditionsWeighted Average Grant Date Fair Value per Unit
Unvested at December 31, 20191,218  $—  964  $4.06  254  $3.73  
Granted—  —  —  —  —  —  
Vested—  —  —  —  —  —  
Forfeited(47) 4.06  (47) 4.06  —  —  
Unvested at June 30, 20201,171  $3.99  917  $4.06  254  $3.73  
Schedule of Share-based Payment Award, Performance Stock Units, Valuation Assumptions
Set forth below is a summary of the valuation inputs for PSUs granted with vesting subject to market conditions during the six month periods ended June 30, 2020 and 2019.

Valuation Inputs for PSUs with Vesting Subject to Market Conditions:Six Months Ended
June 30,
20202019
PSUs Issued (units in thousands)—  254
Risk Free Rate— %2.6 %
Volatility— %55.1 %
Dividend— %— %
Valuation per Share$—  $3.73  
Total Fair Value (in thousands)$—  $947  
Expected Term0 years4 years
Forfeiture Rate Assumed— %8.0 %