CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net loss	$ (54,058)	$ (1,342)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	7,310	842
Amortization of lease right-of-use assets	1,311	400
Deferred income tax benefit	(709)
Stock-based compensation	17,176	7,129
Change in fair value of cash settled stock options	(3,171)
Unrealized foreign currency losses	2,024	87
Amortization of discount on short-term investments	(19)	(112)
Other liabilities	207	689
Changes in operating assets and liabilities:
Accounts receivable, net	9,246	(1,959)
Inventory, net	14,568	(157)
Prepaid expenses and other current assets	(2,235)	(173)
Accounts payable and accrued liabilities	(4,750)	(5,134)
Other assets	1	(62)
Net cash (used in) provided by operating activities	(13,099)	208
Investing activities
Purchases of short-term investments	(18,680)	(16,613)
Proceeds from sales and maturities of short-term investments	19,676	16,189
Purchases of property and equipment	(782)	(651)
Investment in company-owned life insurance	414	(638)
Net cash provided by (used in) investing activities	628	(1,713)
Financing activities
Proceeds from exercise of stock options	4,454	4,607
Proceeds from share purchases under Employee Stock Purchase Plan	1,278	902
Payment of employee taxes related to vested restricted stock units	(1,512)	(102)
Net cash provided by financing activities	4,220	5,407
Effect of exchange rate changes on cash and cash equivalents	(565)	(5)
Net (decrease) increase in cash, cash equivalents and restricted cash	(8,816)	3,897
Cash, cash equivalents and restricted cash at beginning of period	71,756	38,596
Cash, cash equivalents and restricted cash at end of period	62,940	42,493
Supplemental disclosures of cash flow information
Taxes paid	$ 250	$ 40

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