Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 4,455	$ 4,329
Short-term investment securities	30,586	30,870
Accounts receivable, net of allowances of $86 and $63 at March 31, 2019 and December 31, 2018, respectively	16,427	15,864
Inventories, net	12,919	12,848
Prepaid expenses and other assets	1,541	1,416
Total current assets	65,928	65,327
Property and equipment, net	11,740	12,138
Goodwill	3,332	3,332
Intangible assets, net	789	1,029
Other noncurrent assets	1,531	45
TOTAL ASSETS	83,320	81,871
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	6,881	6,083
Accrued liabilities	6,668	5,801
Total current liabilities	13,549	11,884
Long-term liabilities	868	381
Total liabilities	14,417	12,265
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 18,417,701 and 18,271,249 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	18	18
Additional paid-in capital	133,320	133,859
Accumulated deficit	(64,372)	(64,055)
Accumulated other comprehensive loss	(63)	(216)
Total stockholders’ equity	68,903	69,606
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 83,320	$ 81,871