Debt (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2016	Nov. 30, 2015	Oct. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Borrowings						$ 8,000
Repayments						1,000
Interest expense				$ 122	$ 1,203	237	$ 2,213
Amount paid to extinguish debt						$ 1,000
Repayments of equipment financing							$ 1,170
Secured Loan Arrangement
Debt Instrument [Line Items]
Exercise price of warrants (in dollars per share)	$ 2.3229			$ 2.3229		$ 2.3229
Line Of Credit-UBS
Debt Instrument [Line Items]
Borrowing capacity								$ 50,000
Borrowings	$ 8,000		$ 32,000
Repayments	1,000
Remaining borrowing capacity	$ 700			$ 700		$ 700
Effective interest rate (as a percent)	1.10%			1.10%		1.10%
Accrued interest	$ 300
Amount paid to extinguish debt	$ 1,000
Line Of Credit-UBS | 30-day LIBOR
Debt Instrument [Line Items]
Borrowings		$ 10,000
Spread on variable rate (as a percent)						0.65%
Principal balance		$ 42,000