Summary of Significant Accounting Policies - EPS and SBC (Details)		1 Months Ended					6 Months Ended		12 Months Ended
	Dec. 09, 2016 shares	Sep. 30, 2016 shares	Aug. 31, 2016 shares	May 31, 2016 item shares	Jan. 31, 2015 item shares	Nov. 30, 2012 item shares	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2015 $ / shares shares	Jun. 30, 2016 USD ($) item $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares
Computation of Net Loss per Common Share
Options outstanding to purchase common stock and unvested restricted stock							13,878,000		11,919,000	9,739,000	8,486,000
Common stock equivalents under treasury stock method for options (in shares)							1,000		735,000	770,000	1,820,000
Shares issuable upon conversion of convertible notes (in shares) | item							23,878,000		23,878,000
Common stock equivalents under if-converted method for convertible notes (in shares)							23,878,000		718,000
Additional disclosure for options
Stock compensation expense (reduction) | $							$ 8,100,000		$ 21,900,000	$ 15,300,000	$ 15,600,000
Estimated fair value of unvested employee awards, net of estimated forfeitures | $							$ 19,600,000
Weighted average vesting period of unvested employee awards							2 years
Cash received for exercise of stock options | $									$ 5,161,000	$ 4,429,000	$ 9,136,000
Stock options
Weighted-average assumptions used to estimate the fair value of each stock option
Dividend (as a percent)							0.00%		0.00%	0.00%	0.00%
Volatility (as a percent)							65.63%		66.34%	60.86%	60.40%
Risk-free interest rate (as a percent)							1.29%		1.80%	1.84%	1.74%
Expected life							6 years 3 months 18 days		6 years 3 months 18 days	6 years 3 months 18 days	6 years 3 months 18 days
Weighted-average grant date fair values of options granted (in dollars per share) | $ / shares							$ 1.76	$ 6.04	$ 8.91		$ 10.50
Number of Stock Options
Outstanding at the beginning of the period (in shares)							11,813,000	9,689,000	9,689,000
Granted (in shares)							3,536,000		3,340,000
Exercised (in shares)							0		(555,000)
Forfeited/Canceled (in shares)							(1,670,000)		(661,000)
Outstanding at the end of the period (in shares)							13,679,000		11,813,000	9,689,000
Vested or unvested and expected to vest at the end of the period (in shares)							13,516,000		11,475,000
Exercisable at the end of the period (in shares)							7,898,000		6,453,000	5,380,000	4,637,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares							$ 13.03	$ 12.49	$ 12.49
Granted (in dollars per share) | $ / shares							2.90		14.34
Exercised (in dollars per share) | $ / shares									9.30
Forfeited/Canceled (in dollars per share) | $ / shares							10.64		14.84
Outstanding at the end of the period (in dollars per share) | $ / shares							10.70		13.03	$ 12.49
Vested or unvested and expected to vest at the end of the period (in dollars per share) | $ / shares							10.76		13.05
Exercisable at the end of the period (in dollars per share) | $ / shares							$ 13.15		$ 12.63	$ 11.89	$ 9.79
Weighted-Average Remaining Life (in years)
Outstanding at the end of the period							6 years 6 months 18 days		6 years 9 months 26 days
Vested or unvested and expected to vest at the end of the period							6 years 6 months 7 days		6 years 9 months 4 days
Exercisable at the end of the period							4 years 8 months 12 days		5 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding at the end of the period | $							$ 23,000
Vested or unvested and expected to vest at the end of the period | $							22,000
Additional disclosure for options
Total fair value of options vested | $							17,121,000		$ 15,298,000	$ 16,145,000	$ 12,535,000
Total intrinsic value of options exercised | $									3,142,000	3,275,000	9,961,000
Cash received for exercise of stock options | $									5,161,000	4,429,000	9,136,000
Stock options | Chief Executive Officer
Additional disclosure for options
Stock compensation cost due to modification | $							$ 0		$ 3,100,000	$ 0	0
Restricted stock
Number of Restricted Stock
Unvested at the beginning of the period (in shares)							106,250,000	50,000,000	50,000,000
Awarded (in shares)							117,800,000		75,000,000
Vested (in shares)									(18,750,000)
Forfeited (in shares)							(25,100,000)
Unvested at the end of the period (in shares)							198,950,000		106,250,000	50,000,000
Weighted-Average Exercise Price
Unvested at the beginning of the period (in dollars per share) | $ / shares							$ 6.54	$ 9.23	$ 9.23
Awarded (in dollars per share) | $ / shares							3.15		5.65
Vested (in dollars per share) | $ / shares									10.13
Forfeited (in dollars per share) | $ / shares							7.52
Unvested at the end of the period (in dollars per share) | $ / shares							$ 4.41		$ 6.54	$ 9.23
Restricted stock | Officer
Stock-Based Compensation
Vesting period			3 years	4 years	4 years	4 years
Service period			5 years
Number of Restricted Stock
Number of officers | item				3	3	3
Awarded (in shares)			117,800	75,000	25,000	50,000
Deferred share units
Additional disclosure for options
Stock compensation expense (reduction) | $							$ 215,000		$ 380,000	$ 389,000	$ 433,000
2016 Plan
Computation of Net Loss per Common Share
Common stock equivalents under treasury stock method for options (in shares)	14,250,000
Stock-Based Compensation
Number of employee share-based compensation plans | item							1
Common stock authorized for issuance (in shares)	5,500,000
2016 Plan | Stock options
Weighted-average assumptions used to estimate the fair value of each stock option
Number of group of awards for which expected term is calculated for and applied | item							1
2016 Plan | Stock options | Maximum
Stock-Based Compensation
Vesting period							4 years
Exercise period							10 years
Workforce reduction | Stock options
Stock-Based Compensation
Vesting period		3 years
Number of Stock Options
Granted (in shares)		847,000
Forfeited/Canceled (in shares)							(762,000)
Additional disclosure for options
Stock compensation expense (reduction) | $							$ (837,000)