Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Warrants	Treasury Stock	Accumulated Deficit
Beginning balance at Dec. 31, 2015	$ 32,045	$ 267	$ 137,705	$ 0	$ (33,632)	$ (72,295)
Beginning balance (in shares) at Dec. 31, 2015		26,730			3,494
Issuance of common stock upon exercise of stock options and vesting of restricted stock units	(334)	$ 4	(338)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares)		343
Share based compensation	4,882		4,882
Issuance of common stock related to acquisition of Health at Work Wellness Actuaries LLC	0	$ 2	(2)
Issuance of common stock related to acquisition of Health at Work Wellness Actuaries LLC (in shares)		230
Withholding of restricted stock to satisfy tax withholding obligations upon the vesting of the related restricted stock	(190)				$ (190)
Withholding of restricted stock to satisfy tax withholding obligations upon the vesting of the related restricted stock (in shares)					(76)
Net loss	(30,469)					(30,469)
Ending balance at Dec. 31, 2016	5,934	$ 273	142,247	0	$ (33,822)	(102,764)
Ending balance (in shares) at Dec. 31, 2016		27,303			3,570
Issuance of common stock upon exercise of stock options and vesting of restricted stock units	(896)	$ 7	(903)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares)		676
Share based compensation	9,012		9,012
Issuance of common stock related to acquisition of Health at Work Wellness Actuaries LLC	2	$ 2
Issuance of common stock related to acquisition of Health at Work Wellness Actuaries LLC (in shares)		215
Issuance of Warrant and Replacement Warrant	2,840			2,840
Repurchase of common stock	(1,511)				$ (1,511)
Repurchase of common stock (in shares)					(419)
Equity issuance costs	(51)		(51)
Withholding of restricted stock to satisfy tax withholding obligations upon the vesting of the related restricted stock	(412)				$ (412)
Withholding of restricted stock to satisfy tax withholding obligations upon the vesting of the related restricted stock (in shares)					(103)
Net loss	(14,324)					(14,324)
Ending balance at Dec. 31, 2017	$ 594	$ 282	$ 150,305	$ 2,840	$ (35,745)	$ (117,088)
Ending balance (in shares) at Dec. 31, 2017		28,194			4,092