Acquisition - Purchase price allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 633	$ 633
AHS acquisition
Business Acquisition [Line Items]
Accounts receivable, net of allowance of $2	918
Inventory and other current assets	117
Fixed assets	123
Goodwill	633
Accounts payable and accrued expenses	(743)
Deferred revenue	(296)
Purchase Price	7,000
Accounts receivable, allowance	2
AHS acquisition | Customer portal (existing technologies)
Business Acquisition [Line Items]
Intangible assets	4,151
AHS acquisition | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 2,097