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Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Time-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 1,265,434
Number of Shares, Granted | shares 127,158
Number of Shares, Vested | shares (454,498)
Number of Shares, Forfeited or expired | shares (68,602)
Number of Shares, Outstanding, Ending Balance | shares 869,492
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 6.16
Weighted-Average Grant Date Fair Value, Granted | $ / shares 4.06
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.02
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 5.96
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 4.51
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 1,067,809
Number of Shares, Granted | shares 4,915
Number of Shares, Vested | shares (169,793)
Number of Shares, Forfeited or expired | shares (216,313)
Number of Shares, Outstanding, Ending Balance | shares 686,618
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 6.28
Weighted-Average Grant Date Fair Value, Granted | $ / shares 3.40
Weighted-Average Grant Date Fair Value, Vested | $ / shares 8.93
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 8.02
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 3.92