Common Stock (Details)	Jun. 30, 2012
Common stock outstanding and reserved shares of common stock for future issuance
Options outstanding	38,134,900
RSUs	1,032,304
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	146,216,915
Series A [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	20,000,000
Series B [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	32,323,904
Series C [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	7,868,848
Series D [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	30,643,032
2005 Stock Option Plan [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance
2012 Equity Incentive Plan [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	11,213,927
2012 Employee Stock Purchase Plan [Member]
Stock awards available for future grants:
Total reserved shares of common stock for future issuance	5,000,000