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Revenue recognition - Cash Flow Impacts (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 08, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss		$ (9,520)	$ (17,475)	$ (28,782)	$ (46,532)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization				12,243	1,448
Change in valuation of warrant liability				0	3
Non-cash interest expense				3,644	3,274
Gain (Loss) on Disposition of Assets				0	47
Amortization of premiums and accretion of discounts on investments, net				(230)	365
Amortization of debt issuance costs				256	185
Share-based compensation expense				15,831	16,914
Deferred Income Tax Expense (Benefit)				0
Unrealized foreign currency transaction (gains) losses, net				(764)	1,648
Changes in operating assets and liabilities:
Inventory				(3,393)	(2,806)
Prepaid expenses and other current assets				254	(416)
Trade receivables, net				(20,429)	(6,762)
Deposits and other assets				(419)	(463)
Accounts payable and accrued expenses				2,225	12,452
Other liabilities				485	457
Deferred revenue				3,204	4,604
Net cash used in operating activities				(15,875)	(15,582)
Cash flows from investing activities
Purchases of fixed assets				(1,187)	(579)
Purchases of marketable securities				(28,656)	(19,467)
Sale and redemption of marketable securities				35,939	144,357
Acquisition, including transaction costs				0	(76,424)
Net cash provided by investing activities				6,096	47,887
Cash flows from financing activities
Proceeds from exercise of options				3,592	535
Net proceeds from public offerings	$ 117,900			117,874	0
Net cash provided by financing activities				122,765	40,660
Effect of exchange rate changes on cash				(990)	1,725
Net increase in cash and cash equivalents				111,996	74,690
Cash and cash equivalents, beginning of period				111,792	58,321
Cash and cash equivalents, end of period		223,788	$ 133,011	223,788	133,011
Proceeds from shares issued under employee stock purchase plan				1,299	557
Debt issuance costs				0	(432)
Proceeds from issuance of secured term loan				0	$ 40,000
Adjustments | ASU 2014-09
Cash flows from operating activities
Net loss		591		(158)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization				0
Change in valuation of warrant liability				0
Non-cash interest expense				0
Gain (Loss) on Disposition of Assets				0
Amortization of premiums and accretion of discounts on investments, net				0
Amortization of debt issuance costs				0
Share-based compensation expense				0
Deferred Income Tax Expense (Benefit)				0
Unrealized foreign currency transaction (gains) losses, net				0
Changes in operating assets and liabilities:
Inventory				(67)
Prepaid expenses and other current assets				0
Trade receivables, net				0
Deposits and other assets				0
Accounts payable and accrued expenses				(649)
Other liabilities				0
Deferred revenue				874
Net cash used in operating activities				0
Cash flows from investing activities
Purchases of fixed assets				0
Purchases of marketable securities				0
Sale and redemption of marketable securities				0
Acquisition, including transaction costs				0
Net cash provided by investing activities				0
Cash flows from financing activities
Proceeds from exercise of options				0
Net proceeds from public offerings				0
Net cash provided by financing activities				0
Effect of exchange rate changes on cash				0
Net increase in cash and cash equivalents				0
Cash and cash equivalents, beginning of period				0
Cash and cash equivalents, end of period		0		0
Proceeds from shares issued under employee stock purchase plan				0
Debt issuance costs				0
Proceeds from issuance of secured term loan				0
Balances without adoption of Topic 606
Cash flows from operating activities
Net loss		(8,929)		(28,940)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization				12,243
Change in valuation of warrant liability				0
Non-cash interest expense				3,644
Gain (Loss) on Disposition of Assets				0
Amortization of premiums and accretion of discounts on investments, net				(230)
Amortization of debt issuance costs				256
Share-based compensation expense				15,831
Deferred Income Tax Expense (Benefit)				0
Unrealized foreign currency transaction (gains) losses, net				(764)
Changes in operating assets and liabilities:
Inventory				(3,460)
Prepaid expenses and other current assets				254
Trade receivables, net				(20,429)
Deposits and other assets				(419)
Accounts payable and accrued expenses				1,576
Other liabilities				485
Deferred revenue				4,078
Net cash used in operating activities				(15,875)
Cash flows from investing activities
Purchases of fixed assets				(1,187)
Purchases of marketable securities				(28,656)
Sale and redemption of marketable securities				35,939
Acquisition, including transaction costs				0
Net cash provided by investing activities				6,096
Cash flows from financing activities
Proceeds from exercise of options				3,592
Net proceeds from public offerings				117,874
Net cash provided by financing activities				122,765
Effect of exchange rate changes on cash				(990)
Net increase in cash and cash equivalents				111,996
Cash and cash equivalents, beginning of period				111,792
Cash and cash equivalents, end of period		$ 223,788		223,788
Proceeds from shares issued under employee stock purchase plan				1,299
Debt issuance costs				0
Proceeds from issuance of secured term loan				$ 0

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