Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 31, 2015	Apr. 24, 2015	Nov. 17, 2014	Dec. 31, 2015	Dec. 31, 2014	Oct. 20, 2014
Business Acquisition [Line Items]
Unrecognized employee stock-based compensation	$ 14,800			$ 14,800
Goodwill, Other Changes				261	$ 0
Deferred tax liabilities, intangible assets	12,198			12,198	3,036
Total deferred tax assets	37,980			37,980	36,244
Chango
Business Acquisition [Line Items]
Fair value of common stock		$ 72,477
Indemnification assets, shares held in escrow		639,318
Business Combination, Future Service, Shares Held in Escrow		106,553
Cash paid for outstanding debt and transaction expenses		$ 9,097
Business Combination, Contingent Consideration, Shares Held in Escrow		126,098
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	18,200	$ 18,200		$ 18,200
Business Combination, Contingent Consideration, Threshold Trading Days to Determine Number of Shares				10 days
Business Combination, Contingent Consideration, Stock Price Trigger		$ 18.77
Fair value of contingent consideration		$ 16,171
Contingent consideration, shares issued				971,481
Fair value attributed to pre-acquisition stock options exchanged	4,058	4,318
Unrecognized employee stock-based compensation	700	2,400		$ 700
Deferred tax liabilities, intangible assets		13,900
Total deferred tax assets		$ 2,000
Net operating loss acquired				6,900
Measurement period adjustment related to Chango (See Note 7)				(520)	0
Chango | Stock Option
Business Acquisition [Line Items]
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Options Issued		428,798
Chango | General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related costs				1,300
Chango | Common Stock
Business Acquisition [Line Items]
Equity interest issued, number of shares		4,191,878
iSocket
Business Acquisition [Line Items]
Fair value of common stock			$ 11,200
Indemnification assets, shares held in escrow			125,116
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 9,600			$ 9,600
Business Combination, Contingent Consideration, Threshold Trading Days to Determine Number of Shares				10 days
Fair value of contingent consideration			$ 9,100
Contingent consideration, shares issued				585,170
Fair value attributed to pre-acquisition stock options exchanged			2,142
Unrecognized employee stock-based compensation			1,000
Deferred tax liabilities, intangible assets			4,800
Total deferred tax assets			$ 6,400
Fair Value Inputs, Discount Rate			4.80%
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense			$ 1,600
Business Combination, Consideration Transferred, Stock Options Exchanged and Compensation Not yet Recognized			3,100
Measurement period adjustment related to Chango (See Note 7)				$ (2,317)	0
iSocket | Previously Reported
Business Acquisition [Line Items]
Fair value of contingent consideration			$ 11,400
iSocket | General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related costs					$ 400
iSocket | Common Stock
Business Acquisition [Line Items]
Equity interest issued, number of shares			840,885
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			$ 12,000
Shiny
Business Acquisition [Line Items]
Fair value of contingent consideration						$ 700
Business Acquisition, Goodwill, Expected Tax Nondeductible Amount						200
Business Acquisition, Goodwill, Expected Tax Deductible Amount						$ 2,800