Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 131,094	$ 82,759
Short-term investments	216,754	216,331
Accounts receivable	59,887	38,037
Inventories	136,790	99,281
Other current assets	12,876	12,762
Total current assets	557,401	449,170
Property and equipment, net	147,497	144,636
Long-term investments	5,257	5,256
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	308	951
Deferred tax assets, net	12,852	15,917
Other long-term assets	33,271	30,068
Total assets	763,157	652,569
Current liabilities:
Accounts payable	27,603	22,813
Accrued compensation and related benefits	22,996	15,597
Accrued liabilities	34,908	27,507
Total current liabilities	85,507	65,917
Income tax liabilities	31,173	31,621
Other long-term liabilities	36,313	33,024
Total liabilities	152,993	130,562
Commitments and contingencies
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 42,408 and 41,614, respectively	435,085	376,586
Retained earnings	180,819	143,608
Accumulated other comprehensive income (loss)	(5,740)	1,813
Total stockholders’ equity	610,164	522,007
Total liabilities and stockholders’ equity	$ 763,157	$ 652,569