Convertible Preferred Stock (Details) - Jun. 30, 2015 $ / shares in Units, shares in Thousands, $ in Thousands	USD ($) director $ / shares shares
Stock
Convertible preferred stock par value (in dollars per share) | $ / shares	$ 0.0001
Authorized convertible preferred stock (in shares)	51,233
Shares Issued	31,397
Shares Outstanding	31,397
Convertible preferred stock liquidation amount | $	$ 133,757
Convertible preferred stock proceeds, net of issuance costs | $	240,585
Minimum IPO price for automatic conversion | $	40,000
Maximum recapitalization for automatic conversion | $	$ 100,000
Number of directors | director	2
A-1
Stock
Authorized convertible preferred stock (in shares)	5,000
Shares Issued	3,067
Shares Outstanding	3,067
Convertible preferred stock liquidation amount | $	$ 20
Convertible preferred stock proceeds, net of issuance costs | $	$ 20
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 0.0065
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 0.0065
Dividend rate (as a percent)	0.0005%
A
Stock
Authorized convertible preferred stock (in shares)	8,173
Shares Issued	5,014
Shares Outstanding	5,014
Convertible preferred stock liquidation amount | $	$ 4,005
Convertible preferred stock proceeds, net of issuance costs | $	$ 3,927
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 0.7987
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 0.7987
Number of directors | director	1
Dividend rate (as a percent)	0.0639%
B
Stock
Authorized convertible preferred stock (in shares)	5,745
Shares Issued	3,491
Shares Outstanding	3,491
Convertible preferred stock liquidation amount | $	$ 6,600
Convertible preferred stock proceeds, net of issuance costs | $	$ 6,569
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 1.8908
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 1.8908
Number of directors | director	1
Dividend rate (as a percent)	0.1513%
C
Stock
Authorized convertible preferred stock (in shares)	8,941
Shares Issued	5,485
Shares Outstanding	5,485
Convertible preferred stock liquidation amount | $	$ 12,160
Convertible preferred stock proceeds, net of issuance costs | $	$ 58,876
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 2.2168
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 2.2168
Number of directors | director	1
Dividend rate (as a percent)	0.1773%
D
Stock
Authorized convertible preferred stock (in shares)	6,694
Shares Issued	4,107
Shares Outstanding	4,107
Convertible preferred stock liquidation amount | $	$ 20,047
Convertible preferred stock proceeds, net of issuance costs | $	$ 80,788
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 4.8819
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 4.8819
Dividend rate (as a percent)	0.3911%
E
Stock
Authorized convertible preferred stock (in shares)	9,592
Shares Issued	5,884
Shares Outstanding	5,884
Convertible preferred stock liquidation amount | $	$ 35,425
Convertible preferred stock proceeds, net of issuance costs | $	$ 35,019
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 6.0199
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 6.0199
Minimum holder consenting to automatic conversion (as a percent)	70.00%
Dividend rate (as a percent)	0.4817%
F
Stock
Authorized convertible preferred stock (in shares)	7,088
Shares Issued	4,349
Shares Outstanding	4,349
Convertible preferred stock liquidation amount | $	$ 55,500
Convertible preferred stock proceeds, net of issuance costs | $	$ 55,386
Convertible preferred stock conversion numerator (in dollars per share) | $ / shares	$ 12.7629
Convertible preferred stock conversion denominator (in dollars per share) | $ / shares	$ 12.7629
Dividend rate (as a percent)	1.021%