Warrants (Details) $ / shares in Units, $ in Millions	Sep. 29, 2017 USD ($) item $ / shares shares	Mar. 31, 2018 item shares
Class of Warrant or Right [Line Items]
Number of calendar days prior to warrant issue the average closing price of common stock used to determine warrant exercise price	30 days
Common Stock
Class of Warrant or Right [Line Items]
Warrant exercise price | $ / shares	$ 1.39
Warrant One
Class of Warrant or Right [Line Items]
Proceeds from Warrant Exercises | $	$ 4.6
Warrant Two
Class of Warrant or Right [Line Items]
Number of shares into which the remaining warrant could be converted		722,000
Expected term of warrants	10 years
Historic volatility used to value the warrants	91.10%
Interest rate assumption used to value the warrants	2.28%
Number of other warrants outstanding | item		0
License Agreement | ABX
Class of Warrant or Right [Line Items]
Number Of Warrants Issued Per Agreement | item	2
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	4,000,000
Stock Issued During Period Shares Warrant Exercise	3,278,000
License Agreement | Maximum | ABX
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	4,000,000