CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32,415	$ 16,596
Short term investments	40,885	61,678
Trade accounts receivable, net of allowance of $196 and $428	4,969	5,080
Inventories, net of provision for obsolescence of $398 and $439	5,598	5,297
Prepaid expenses and other current assets	1,449	1,184
Total current assets	85,316	89,835
Property and equipment, net	6,031	5,788
Intangibles	190	191
Deposits	80	73
Other assets	239	41
Total assets	91,856	95,928
Current liabilities:
Accounts payable	1,504	1,423
Accrued and other liabilities	5,587	5,865
Joint and several payroll liability	1,014	713
Accrued severance and related	511	610
Total current liabilities	8,616	8,611
Note payable	140	140
Long term lease liability	75
Other long-term liabilities	194	0
Total liabilities	9,025	8,751
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value; 75,000,000 shares authorized; 34,033,255 issued and 33,891,255 outstanding as of March 31, 2019 and 33,847,100 issued and 33,704,525 outstanding as of December 31, 2018	34	34
Additional paid-in capital	54,182	52,920
Retained earnings	28,615	34,223
Total stockholders’ equity	82,831	87,177	$ 21,469	$ 22,032
Total liabilities and stockholders’ equity	$ 91,856	$ 95,928