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Revenue recognition - Cash Flow Impacts (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net loss		$ (72,113)	$ (19,263)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		7,059	6,022
Non-cash interest expense		1,982	1,780
Amortization of (discounts) premiums on investments, net		(257)	(96)
Share-based compensation expense		9,263	7,748
Unrealized foreign currency transaction losses (gains), net		865	(1,300)
Changes in operating assets and liabilities:
Inventory		(334)	(1,446)
Prepaid expenses and other current assets		(191)	958
Trade receivables, net		20,786	(4,223)
Deposits and other assets		(10,754)	(308)
Accounts payable and accrued expenses		(28,653)	(6,810)
Other liabilities		8,065	(475)
Deferred revenue		574	1,409
Net cash used in operating activities		(42,409)	(15,878)
Cash flows from investing activities
Purchases of fixed assets		(2,865)	(479)
Purchases of marketable securities		(165,723)	(22,683)
Sale and redemption of marketable securities		18,090	21,514
Net cash used in investing activities		(150,498)	(1,648)
Cash flows from financing activities
Proceeds from exercise of options		1,281	1,136
Net proceeds from public offerings	$ 224,400	224,441	0
Net cash provided by financing activities		225,722	1,136
Effect of exchange rate changes on cash		(1,169)	2,273
Net increase in cash and cash equivalents		31,646	(14,117)
Cash and cash equivalents, beginning of period	$ 169,498	169,498	111,792
Cash and cash equivalents, end of period		$ 201,144	$ 97,675

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