Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 8,489	$ 6,490
Marketable securities	24,114	19,994
Trade accounts receivable, net of allowance for doubtful accounts of $516 and $287, as of September 30, 2018 and December 31, 2017, respectively	6,077	4,005
Other current assets	2,370	2,438
Total current assets	41,050	32,927
Marketable securities, long term	4,250	14,883
Equity method investments	1,746	1,937
Fixed assets, net	6,853	7,272
Deferred tax asset	929	126
Other long-term assets	18	39
Total assets	54,846	57,184
Current liabilities
Accounts payable	1,024	2,089
Accrued liabilities	1,231	911
Total current liabilities	2,255	3,000
Other long-term liabilities	11	6
Total liabilities	2,266	3,006
Commitments and contingencies (Note 8)
Stockholders’ equity
Common stock, $0.0001 par value per share, 50,000 shares authorized, 18,057 and 17,847 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	2	2
Preferred stock, $0.0001 par value per share, 1,000 shares authorized, no shares issued or outstanding at September 30, 2018 and December 31, 2017
Additional paid-in capital	113,600	111,884
Accumulated other comprehensive loss	(57)	(44)
Accumulated deficit	(60,965)	(57,664)
Total stockholders’ equity	52,580	54,178
Total liabilities and stockholders’ equity	$ 54,846	$ 57,184