Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 43,694	$ 28,165
Trade accounts receivable, net of allowance for doubtful accounts of $539 and $417 in 2018 and 2017, respectively	10,037	10,875
Inventories	4,717	4,978
Prepaid expenses and other current assets	1,792	1,011
Total current assets	60,240	45,029
Property, plant and equipment, net	5,873	6,219
Intangible assets, net	1,278	1,428
Goodwill	38,182	38,182
Other long-term assets	109	245
Total assets	105,682	91,103
Current liabilities:
Accounts payable	1,431	2,043
Accrued liabilities	8,534	8,827
Accrued compensation	4,748	4,392
Short-term debt		789
Total current liabilities	14,713	16,051
Other long-term liabilities	692	993
Long-term debt, net	38,674	25,886
Total liabilities	54,079	42,930
Commitments and contingencies (Note 8)
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 shares authorized; 14,254,086 and 10,849,385 shares issued and outstanding in 2018 and 2017, respectively	14	11
Additional paid-in capital	151,736	125,999
Accumulated other comprehensive loss		(1)
Accumulated deficit	(100,147)	(77,836)
Total stockholders’ equity	51,603	48,173
Total liabilities and stockholders’ equity	$ 105,682	$ 91,103