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Stock-Based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense for restricted stock, restricted stock units, stock options and issuances of common stock pursuant to our employee stock purchase plan was classified in the accompanying consolidated statements of operations as follows:

		Three Months Ended March 31,
		2016				2015
		(in thousands)
Stock-based compensation expense:
Cost of revenue		$	137			$	49
Research and development			1,493				144
Sales and marketing			2,901				115
General and administrative			988				267
Total stock-based compensation expense		$	5,519			$	575

Summary of Restricted Stock and Restricted Stock Unit Activity

Restricted stock and restricted stock unit activity during the three months ended March 31, 2016 was as follows:

		Restricted Stock				Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2015			1,149,257			$	19.34
Granted			528,550				12.97
Vested			(84,649	)			19.14
Forfeited			(32,290	)			13.61
Outstanding as of March 31, 2016			1,560,868			$	17.31

Summary of Stock Option Activity

Stock option activity during the three months ended March 31, 2016 was as follows:

		Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (in years)				Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2015			4,246,525			$	5.99
Granted			916,558				12.96
Exercised			(122,284	)			4.13
Forfeited/cancelled			(159,444	)			10.11
Outstanding as of March 31, 2016			4,881,355				7.21				7.6			$	29,337
Vested and exercisable as of March 31, 2016			2,793,056				4.53				6.6			$	23,891
Vested and expected to vest as of March 31, 2016			4,460,388				6.78				7.4			$	28,639

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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