Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 112,703	$ 90,860
Short-term investments	155,521	144,103
Accounts receivable, net	34,248	30,830
Inventories	71,469	63,209
Other current assets	9,043	2,926
Total current assets	382,984	331,928
Property and equipment, net	85,171	65,359
Long-term investments	5,354	5,361
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	3,002	5,053
Deferred tax assets, net	633	672
Other long-term assets	27,411	16,341
Total assets	511,126	431,285
Current liabilities:
Accounts payable	17,427	13,487
Accrued compensation and related benefits	12,578	9,812
Accrued liabilities	22,916	19,984
Total current liabilities	52,921	43,283
Income tax liabilities	3,870	2,941
Other long-term liabilities	23,219	16,545
Total liabilities	80,010	62,769
Commitments and contingencies (notes 12, 13 and 14)
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 40,793 and 39,689 as of December 31, 2016 and December 31, 2015, respectively	315,969	265,763
Retained earnings	119,362	101,287
Accumulated other comprehensive income (loss)	(4,215)	1,466
Total stockholders’ equity	431,116	368,516
Total liabilities and stockholders’ equity	$ 511,126	$ 431,285