Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Tax benefit of operating loss carry forward	$ 11,612	$ 10,385
Reserves and allowances	12	148
Accrued expenses	35	73
Charitable contributions	198	190
Stock-based compensation	1,098	846
Fixed assets	102	330
Texas margin tax temporary credit	239	246
Total deferred tax assets	13,296	12,218
Valuation allowance	(13,192)	(11,844)
Net deferred tax assets	104	374
Deferred tax liabilities:
481(a) adjustment	0	2
Goodwill	230	309
Intangible amortization	104	372
Total deferred tax liabilities	334	683
Net deferred tax liability	$ (230)	$ (309)