Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Total revenue	$ 11,725	$ 10,558	$ 25,439	$ 21,517
Operating expenses:
Total cost of revenue, exclusive of depreciation and amortization	3,564	3,313	7,490	6,752
Product development	3,723	3,586	7,164	6,907
Sales and marketing	3,253	3,018	6,761	6,468
General and administrative	3,893	3,115	7,296	6,410
Depreciation and amortization	1,356	1,726	2,783	3,271
Total operating expenses	15,789	14,758	31,494	29,808
Operating loss	(4,064)	(4,200)	(6,055)	(8,291)
Non-operating income (expense):
Interest and other borrowing costs	(343)	(1,050)	(609)	(2,019)
Loss on early extinguishment of debt		(1,834)		(1,834)
Change in fair value of warrant liability	(125)	263	(15)	360
Other non-operating income		31	1	41
Total non-operating expense	(468)	(2,590)	(623)	(3,452)
Loss before income taxes	(4,532)	(6,790)	(6,678)	(11,743)
Income tax (provision) benefit	(6)	(13)	9	(12)
Net loss	(4,538)	(6,803)	(6,669)	(11,755)
Dividends related to 7% Series B convertible preferred stock	(146)	(146)	(292)	(292)
Net loss available to common stockholders	$ (4,684)	$ (6,949)	$ (6,961)	$ (12,047)
Per share of common stock:
Basic net loss available to common stockholders	$ (0.15)	$ (0.22)	$ (0.22)	$ (0.41)
Diluted net loss available to common stockholders	$ (0.15)	$ (0.22)	$ (0.22)	$ (0.41)
Shares used to calculate basic net loss per share	31,927	31,336	31,837	29,379
Shares used to calculate diluted net loss per share	31,927	31,336	31,837	29,379
Subscription Revenue [Member]
Revenue:
Total revenue	$ 10,995	$ 9,943	$ 23,981	$ 20,286
Other Revenue [Member]
Revenue:
Total revenue	730	615	1,458	1,231
Total Cost of Revenue [Member]
Stock-based compensation expense is included in individual line items above:
Stock-based compensation expense	164	156	339	237
Product Development [Member]
Stock-based compensation expense is included in individual line items above:
Stock-based compensation expense	337	195	688	329
Sales and Marketing [Member]
Stock-based compensation expense is included in individual line items above:
Stock-based compensation expense	158		342	123
General and Administrative [Member]
Stock-based compensation expense is included in individual line items above:
Stock-based compensation expense	$ 469	$ 407	$ 1,039	$ 761