Stockholders' Equity - Common Stock (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Class of Stock [Line Items]
Warrants exercised (in shares)	4,820,000
Restricted stock units issued during period (in shares)	904,702
Common Stock
Class of Stock [Line Items]
Shares of common stock issued (in shares)	6,041,369
Warrants exercised (in shares)	5,136,667
Common stock, price per share (in dollars per share) | $ / shares	$ 0.28