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Equity Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan The following table sets forth the components of the Company’s share-based compensation expense for the three month periods ended March 31, 2020 and 2019 (in thousands):
Three Months Ended
March 31,
20202019
Stock options$825  $1,381  
Employee stock purchase plan—  229  
Restricted stock units and Performance share units2,606  3,110  
Total stock-based compensation expense$3,431  $4,720  
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 month periods ended March 31, 2020 and 2019, respectively, along with the weighted-average grant date fair values:
Three Months Ended
March 31,
20202019
Expected volatility60.0 %66.8 %
Expected life (in years)6.36.2
Risk-free interest rate1.0 %2.5 %
Dividend yield—  —  
Weighted-average grant date fair value per stock option$0.59  $2.44  
Forfeiture rate8.0 %8.0 %
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 three month period ended March 31, 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(271) 15.38    
Outstanding at March 31, 20205,018  $14.05  6.7$—  
Exercisable at March 31, 20202,048  $27.02  3.5$—  

(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. Includes only those options that were in-the-money as of March 31, 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 three month period ended March 31, 2020:

Number of Units
(in thousands)		Weighted Average Per Share
Grant Date Fair Value
Unvested at December 31, 20195,074  $7.07  
Granted48  $1.50  
Vested(196) $4.02  
Forfeited(190) $9.52  
Unvested at March 31, 20204,736  $7.04  
Schedule of Nonvested Performance-based Units Activity
Set forth below is a summary of unvested PSU activity during the three month period ended March 31, 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 March 31, 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 three month periods ended March 31, 2020 and 2019.

Valuation Inputs for PSUs with Vesting Subject to Market Conditions:Three Months Ended
March 31,
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 %