Debt - Convertible Notes (Details) - 2015 Convertible Notes $ / shares in Units, $ in Thousands	1 Months Ended
	May 31, 2015 USD ($) D $ / shares
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