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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities    
Net loss $ (20,272) $ (22,299)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,794 1,480
Share-based compensation expense 1,605 2,648
Change in fair value of derivative financial instruments 105 (244)
Unrealized foreign exchange results 174 2,304
Change in deferred taxes   557
Change in lease incentive 1,305 (149)
Changes in operating assets and liabilities:    
Accounts receivable, prepaid expenses and other current assets 8,154 449
Inventories   31
Accounts payable (683) 1,191
Accrued expenses and other liabilities (2,584) (276)
Deferred revenue (1,268) (1,418)
Net cash used in operating activities (11,670) (15,726)
Cash flows from investing activities    
Restricted cash   (608)
Purchase of property, plant and equipment (1,969) (1,867)
Net cash used in investing activities (1,969) (2,475)
Cash flows from financing activities    
Proceeds from issuance of shares 441 820
Repayment of capital lease obligations   (48)
Net cash generated from financing activities 441 772
Currency effect cash and cash equivalents 973 5,483
Net increase / (decrease) in cash and cash equivalents (12,225) (11,946)
Cash and cash equivalents at beginning of period 132,496 221,626
Cash and cash equivalents at end of period 120,271 209,680
Supplemental cash flow disclosures:    
Cash paid for interest 413 521
Non-cash adjustments in purchases of intangible assets and property, plant and equipment $ (949) $ 150