Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net loss	$ (80,270)	$ (115,314)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,743	2,477
Change in valuation of warrant liability	3	44
Non-cash interest expense	4,999	4,487
Loss on disposal of asset	5	0
Amortization of premiums on investments	493	1,610
Amortization of debt issuance costs	308	224
Share-based compensation expense	24,082	26,610
Benefit for deferred income taxes	0	(222)
Unrealized foreign currency transaction (gains) losses, net	(364)	1,401
Changes in operating assets and liabilities:
Inventory, net	(3,625)	0
Prepaid expenses and other current assets	(570)	1,095
Trade receivables, net	(10,994)	(16,035)
Deposits and other assets	(485)	(154)
Accounts payable and accrued expenses	11,807	2,080
Other liabilities	807	682
Deferred revenue	10,710	768
Net cash used in operating activities	(31,351)	(90,247)
Cash flows from investing activities
Purchases of fixed assets	(1,058)	(540)
Purchases of marketable securities	(19,467)	(73,692)
Sale and redemption of marketable securities	164,847	155,582
Acquisition, including transaction costs	(77,163)	0
Net cash provided by investing activities	67,159	81,350
Cash flows from financing activities
Proceeds from exercise of options	1,437	926
Proceeds from shares issued under employee stock purchase plan	1,362	0
Debt issuance costs related to secured term loan	(432)	0
Proceeds from issuance of secured term loan	40,000	0
Net cash provided by financing activities	42,367	926
Effect of exchange rate changes on cash	5,342	235
Net increase (decrease) in cash and cash equivalents	83,517	(7,736)
Cash and cash equivalents, beginning of period	58,321	58,022
Cash and cash equivalents, end of period	141,838	50,286
Supplemental disclosure of cash information
Cash paid for interest	5,496	4,513
Cash paid for income taxes	616	633
Supplemental disclosures of non-cash information related to investing and financing activities
Change in unrealized gain on marketable securities, net of tax	$ 0	$ 429