Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements – Adoption of ASU 2017-11 (Details)

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Fair Value Measurements – Adoption of ASU 2017-11 (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Additional Paid-in Capital $ 889,585 $ 874,697
Accumulated deficit $ (862,225) (852,199)
ASU 2017-11    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Additional Paid-in Capital   874,697
Accumulated deficit   (852,199)
ASU 2017-11 | Prior to adoption    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Warrant Liability   2,917
Additional Paid-in Capital   870,457
Accumulated deficit   (850,876)
ASU 2017-11 | Reclassified warrant liability    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Warrant Liability   (4,240)
Additional Paid-in Capital   4,240
ASU 2017-11 | Reclassified unrealized gain on warrant liability    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Warrant Liability   1,323
Accumulated deficit   $ (1,323)