Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets, non- current
Provision for doubtful accounts	$ 1,345	$ 1,266
Accrued expenses	2,936	964
Deferred revenue	3,416	3,098
Deferred rent	3,331	490
Stock-based compensation	2,233	1,334
Acquisition costs	126	117
Subsidiary unit compensation	425	88
Equity investments	180	29
Inventory reserve	123	0
Net operating losses	3,183	3,824
Capital losses	0	11
Deferred tax assets, non-current	17,298	11,221
Deferred tax liabilities, non-current
Intangible assets and prepaid patent licenses	(2,098)	(1,799)
Depreciation	(3,105)	(1,059)
Contingent consideration	(180)	0
Deferred Tax Liabilities, Net	(5,383)	(2,858)
Net deferred tax assets	$ 11,915	$ 8,363