Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] IPO [Member]	Additional Paid-in Capital [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Series C redeemable convertible preferred stock [Member] USD ($)	Series A redeemable convertible preferred stock [Member] USD ($)	Series B redeemable convertible preferred stock [Member] USD ($)	Series D convertible preferred stock [Member] USD ($)
Beginning Balance at Jun. 30, 2009	$ (21,690)	$ 33		$ 0	$ (21,759)	$ 36	$ 5,911	$ 3,298	$ 6,133	$ 0
Beginning Balance (in shares) at Jun. 30, 2009		32,966,984					983,606	2,500,000	3,988,636	0
Conversion of preferred stock to common stock upon initial public offering	0
Stock option exercises (in shares)	7,036,768	7,036,768
Stock option exercises	241	7		234
Stock issued (in shares)										2,990,635
Stock issued										51,245
Buyback and retirement of common stock	(19,985)	(24)		(779)	(19,182)
Buyback and retirement of common stock (shares)		(23,510,264)
Stock-based compensation	545			545
Accretion of preferred stock dividends and issuance costs	(640)				(640)		19	206	415
Other comprehensive income (loss)	(28)					(28)
Net income (loss)	(29,705)				(29,705)
Ending Balance at Jun. 30, 2010	(71,262)	16		0	(71,286)	8	5,930	3,504	6,548	51,245
Ending 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
Stock option exercises (in shares)	4,279,456	4,279,456
Stock option exercises	446	5		441
Tax benefit from exercise of nonqualified stock options	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)	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
Stock option exercises (in shares)	1,469,118	1,469,118
Stock option exercises	1,284	1		1,283
Tax benefit from exercise of nonqualified stock options	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)	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	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	49,850	2		49,848
Stock option exercises (in shares)	6,654,558	6,654,558
Stock option exercises	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
Stock issued (in shares)			10,350,000
Tax benefit from exercise of nonqualified stock options	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	(1,960)			(1,960)
Buyback and retirement of common stock (shares)		(184,164)
Stock-based compensation	28,067			28,067
Accretion of preferred stock dividends and issuance costs	(308)			(308)			9	100	199
Other comprehensive income (loss)	(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