Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Series C redeemable convertible preferred stock	Series A redeemable convertible preferred stock	Series B redeemable convertible preferred stock	Series D convertible preferred stock
Beginning Balance at Jun. 30, 2010	$ (71,262)	$ 16	$ 0	$ (71,286)	$ 8	$ 5,930	$ 3,504	$ 6,548	$ 51,245
Beginning Balance (in shares) at Jun. 30, 2010		16,493,488				983,606	2,500,000	3,988,636	2,990,635
Conversion of preferred stock to common stock upon initial public offering	0
Issuance of common stock upon follow-on offering, net of issuance costs	0
Common stock issued under employee stock plans (in shares)		4,279,456
Common stock issued under employee stock plans	446	5	441
Tax benefit from employee stock plans	138		138
Vesting of early exercised stock options	36		36
Stock-based compensation	2,954		2,954
Accretion of preferred stock dividends and issuance costs	(633)		(633)			18	200	415
Other comprehensive income (loss), net	110				110
Net income (loss)	9,830			9,830
Ending Balance at Jun. 30, 2011	(58,381)	21	2,936	(61,456)	118	5,948	3,704	6,963	51,245
Ending Balance (in shares) at Jun. 30, 2011		20,772,944				983,606	2,500,000	3,988,636	2,990,635
Conversion of preferred stock to common stock upon initial public offering	0
Issuance of common stock upon follow-on offering, net of issuance costs	0
Common stock issued under employee stock plans (in shares)		1,469,118
Common stock issued under employee stock plans	1,284	1	1,283
Tax benefit from employee stock plans	41		41
Vesting of early exercised stock options	208		208
Buyback and retirement of common stock (shares)		12,084
Stock-based compensation	5,637		5,637
Accretion of preferred stock dividends and issuance costs	(312)		(312)			9	101	202
Other comprehensive income (loss), net	781				781
Net income (loss)	(6,684)			(6,684)
Ending Balance at Dec. 31, 2011	(57,426)	22	9,793	(68,140)	899	5,957	3,805	7,165	51,245
Ending Balance (in shares) at Dec. 31, 2011		22,229,978				983,606	2,500,000	3,988,636	2,990,635
Issuance of common stock upon initial public offering, net of offering costs (in shares)		10,350,000
Issuance of common stock upon initial public offering, net of offering costs	169,784	10	169,774
Conversion of preferred stock to common stock upon initial public offering (in shares)		(83,703,016)				983,606	2,500,000	3,988,636	2,990,635
Conversion of preferred stock to common stock upon initial public offering	68,480	84	68,396			(5,966)	(3,905)	(7,364)	(51,245)
Issuance of common stock upon follow-on offering, net of issuance costs (in shares)		1,897,500
Issuance of common stock upon follow-on offering, net of issuance costs	(50,561)	2	49,848
Common stock issued under employee stock plans (in shares)	6,654,558	6,654,558
Common stock issued under employee stock plans	4,053	6	4,047
Issuance of common stock to third party investors, net of issuance costs (in shares)		1,750,980
Issuance of common stock to third party investors, net of issuance costs	17,848	2	17,846
Common stock issued under employee stock plans	49,850
Tax benefit from employee stock plans	1,694		1,694
Vesting of early exercised stock options	1,606		1,606
Buyback of restricted common stock (in shares)		(34,168)
Buyback and retirement of common stock (shares)		(184,164)
Buyback and retirement of common stock	(1,960)		(1,960)
Stock-based compensation	28,067		28,067
Accretion of preferred stock dividends and issuance costs	(308)		(308)			9	100	199
Other comprehensive income (loss), net	(935)				(935)
Net income (loss)	(37,348)			(37,348)
Ending Balance at Dec. 31, 2012	243,405	126	348,803	(105,488)	(36)	0	0	0	0
Ending Balance (in shares) at Dec. 31, 2012		126,367,700				0	0	0	0
Conversion of preferred stock to common stock upon initial public offering	0
Issuance of common stock upon follow-on offering, net of issuance costs	698
Common stock issued under employee stock plans (in shares)	12,951,123
Common stock issued under employee stock plans (in shares)		13,986,905
Common stock issued under employee stock plans	56,498	14	56,484
Tax benefit from employee stock plans	1,658		1,658
Vesting of early exercised stock options	381		381
Stock-based compensation	65,694		65,694
Equity component of the convertible notes, net	152,061		152,061
Purchase of convertible note hedge	(135,815)		(135,815)
Sales of warrants	84,525		84,525
Other comprehensive income (loss), net	(440)				(440)
Net income (loss)	(73,708)			(73,708)
Ending Balance at Dec. 31, 2013	$ 394,259	$ 140	$ 573,791	$ (179,196)	$ (476)	$ 0	$ 0	$ 0	$ 0
Ending Balance (in shares) at Dec. 31, 2013		140,354,605				0	0	0	0