Stockholders' Equity - RSA Activity (Details) - Restricted Stock Awards	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Number of RSAs
Outstanding, beginning balance (in shares) | shares	4,036,398
Granted (in shares) | shares	620,277
Vested (in shares) | shares	(295,389)
Forfeited or expired (in shares) | shares	(112,723)
Outstanding, ending balance (in shares) | shares	4,248,563
Weighted-average Stock Price
Outstanding, Beginning Balance, Weighted-average Stock Price (in dollars per share) | $ / shares	$ 4.85
Granted, Weighted-average Stock Price (in dollars per share) | $ / shares	5.51
Vested, Weighted-average Stock Price (in dollars per share) | $ / shares	5.18
Forfeited or expired, Weighted-average Stock Price (in dollars per share) | $ / shares	5.57
Outstanding, Ending Balance, Weighted-average Stock Price (in dollars per share) | $ / shares	$ 4.90