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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net (loss) income	$ (12,951)	$ (92)	$ 4,522
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	6,264	5,482	4,722
Loss on disposal of fixed assets	156	6	40
Stock-based compensation	25,704	17,592	8,786
Change in fair value of stock warrant liability			(43)
Unrealized foreign currency losses (gains)	1,647	(951)	368
Amortization of (discount) premium on short-term investments	(295)	20	210
Deferred rent and other liabilities	1,919	722	(31)
Changes in operating assets and liabilities:
Accounts receivable, net	(2,252)	(2,181)	(6,791)
Inventory, net	(2,303)	(4,162)	(2,935)
Prepaid expenses and other current assets	(1,756)	494	(1,762)
Accounts payable and accrued liabilities	2,527	9,741	5,096
Deferred tax asset and receivable, net		(235)
Other assets	204	(345)	127
Net cash provided by operating activities	18,864	26,091	12,309
Investing activities
Purchases of property and equipment	(10,315)	(6,311)	(6,278)
Purchases of short-term investments	(93,696)	(94,307)	(75,192)
Proceeds from sales and maturities of short-term investments	78,851	88,891	55,354
Investment in company-owned life insurance	(1,240)	(663)
Net cash used in investing activities	(26,400)	(12,390)	(26,116)
Financing activities
Proceeds from exercise of stock options	18,654	3,699	6,059
Share purchases under Employee Stock Purchase Plan	3,509	968	1,945
Payments of employee taxs related to vested restricted stock units	(587)
Payments of subordinated notes			(9,696)
Proceeds from exercise of stock warrants			50
Net cash provided by (used in) financing activities	21,576	4,667	(1,642)
Effect of exchange rate changes on cash and cash equivalents	48	(434)	371
Net increase (decrease) in cash, cash equivalents and restricted cash	14,088	17,934	(15,078)
Cash, cash equivalents and restricted cash at beginning of period	24,508	6,574	21,652
Cash, cash equivalents and restricted cash at end of period	38,596	24,508	6,574
Supplemental disclosures of cash flow information
Taxes paid, net of refunds	$ 401	12	513
Interest paid			285
Supplemental schedule of noncash investing and financing activities
Reduction of liability upon vesting of stock options previously exercised for unvested stock		$ 4	$ 62

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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

+ References

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-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-SubTopic 10
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X

- References

No definition available.

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