Debt - Convertible Notes (Details) $ / shares in Units, $ in Thousands		1 Months Ended
	Apr. 15, 2020 USD ($) $ / shares shares	May 31, 2015 USD ($) D $ / shares
2015 Convertible Notes
Convertible Notes
Amount of debt issued | $		$ 25,000
Interest rate of debt (as a percent)		7.50%
Transaction costs | $		$ 50
Conversion price (in dollars per share) | $ / shares		$ 21.50
Conditional conversion price (in dollars per share) | $ / shares		$ 30.10
Number of trading days for which stock price must exceed specified price | D		20
Number of consecutive trading days during which stock price must exceed specified price | D		30
Amended Notes
Convertible Notes
Amount of debt issued | $	$ 25,000
Interest rate of debt (as a percent)	7.00%
Agreement term	6 months
Aggregate number of common shares which can be purchased with warrants issued | shares	212,649
Warrant cash exercise price | $ / shares	$ 2.97