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Stock-Based Compensation - Schedule of Restricted Stock and Restricted Stock Units Activity (Details)
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Number of Shares  
Nonvested at beginning of period, (in shares) | shares 2,570
Granted, (in shares) | shares 4,148
Vested, (in shares) | shares (926)
Forfeited, (in shares) | shares (401)
Nonvested at end of period, (in shares) | shares 5,391
Weighted Average Grant Date Fair Value  
Nonvested at beginning of period, (in dollars per share) | $ / shares $ 1.23
Granted, (in dollars per share) | $ / shares 0.85
Vested, (in dollars per share) | $ / shares 1.08
Forfeited, (in dollars per shares) | $ / shares 0.96
Nonvested at end of period, (in dollars per share) | $ / shares $ 1.04