Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 14,960	$ 14,855
Short-term investment securities	18,002	18,456
Accounts receivable, net of allowance for doubtful accounts of $260 and $273 at March 31, 2017 and December 31, 2016, respectively	18,347	19,101
Inventories, net	12,692	14,442
Prepaid expenses and other assets	1,219	1,548
Total current assets	65,220	68,402
Property and equipment, net	13,059	12,609
Goodwill	3,332	3,332
Intangible assets, net	2,985	3,275
Deferred tax assets, net	5,399	4,512
Other noncurrent assets	35	36
TOTAL ASSETS	90,030	92,166
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	5,284	6,073
Accrued liabilities	5,621	7,177
Total current liabilities	10,905	13,250
Other long-term liabilities	489	391
Total liabilities	11,394	13,641
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 17,686,129 and 17,335,122 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	18	17
Additional paid-in capital	134,059	134,480
Accumulated deficit	(55,110)	(55,590)
Accumulated other comprehensive loss	(331)	(382)
Total stockholders’ equity	78,636	78,525
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 90,030	$ 92,166