Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 12,452	$ 5,559
Short-term investment securities	22,285	32,499
Accounts receivable, net of allowances of $66 and $319 at March 31, 2018 and December 31, 2017, respectively	19,026	18,624
Inventories, net	12,582	12,756
Prepaid expenses and other assets	1,874	1,605
Total current assets	68,219	71,043
Property and equipment, net	12,537	12,369
Goodwill	3,332	3,332
Intangible assets, net	1,823	2,113
Deferred tax assets, net	8,068	7,734
Other noncurrent assets	64	72
TOTAL ASSETS	94,043	96,663
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	5,226	5,471
Accrued liabilities	5,787	7,481
Total current liabilities	11,013	12,952
Long-term liabilities	485	392
Total liabilities	11,498	13,344
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 18,258,643 and 17,806,792 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	18	18
Additional paid-in capital	134,253	134,505
Accumulated deficit	(52,024)	(51,258)
Accumulated other comprehensive loss	298	54
Total stockholders’ equity	82,545	83,319
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 94,043	$ 96,663