Stockholders' Equity - RSA Activity (Details) - Restricted Stock Awards	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Number of Restricted Stock Awards
Outstanding, Beginning balance (in shares) | shares	4,036,398
Granted (in shares) | shares	620,277
Vested (in shares) | shares	(1,648,692)
Forfeited or expired (in shares) | shares	(120,137)
Outstanding, Ending balance (in shares) | shares	2,887,846
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	4.85
Forfeited or expired, Weighted-average Stock Price (in dollars per share) | $ / shares	5.54
Outstanding, Ending balance, Weighted-average Stock Price (in dollars per share) | $ / shares	$ 4.95