Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 19,345	$ 21,790
Short-term investment securities	39,546	36,105
Accounts receivable, net of allowance for doubtful accounts of $145 and $130 at September 30, 2014 and December 31, 2013, respectively	20,236	18,603
Inventories, net	16,367	14,535
Deferred tax assets, net	2,303	1,629
Prepaid expenses and other assets	1,444	3,166
Total current assets	99,241	95,828
Property and equipment, net	14,898	14,971
Goodwill	161	161
Intangible assets, net	3,102	4,604
Deferred tax assets, net	10,685	11,827
Other noncurrent assets	39	41
TOTAL ASSETS	128,126	127,432
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	5,436	4,440
Accrued liabilities	8,495	7,803
Total current liabilities	13,931	12,243
Other long-term liabilities	551	3,137
Total liabilities	14,482	15,380
Stockholders' equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 18,503,259 and 18,566,119 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	19	19
Additional paid-in capital	144,804	143,572
Accumulated deficit	(31,355)	(31,748)
Accumulated other comprehensive income	176	209
Total stockholders' equity	113,644	112,052
TOTAL LIABILITIES AND EQUITY	$ 128,126	$ 127,432