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Stock award plan (Tables)

6 Months Ended

Jun. 30, 2015

Stock award plan

Summary of stock option activity

		Number of options		Weighted- average exercise price			Weighted- average remaining contractual term		Aggregate intrinsic value
									(in thousands)
Outstanding at December 31, 2014		3,432,972		$	25.00
Granted		1,916,100		$	53.47
Exercised		(612,645	)	$	13.18
Forfeited		(70,681	)	$	42.80
Expired		(1,894	)	$	285.48
Outstanding at June 30, 2015		4,663,852		$	37.84		8.8 years		$	72,654
Vested or Expected to vest at June 30, 2015		4,339,328		$	37.16		8.8 years		$	68,629
Exercisable at June 30, 2015		944,708		$	33.55		8.1 years		$	28,081

Schedule of assumptions used to estimate fair value of grants made on the date of grant

		Six months ended June 30, 2015
Risk-free interest rate		1.49% — 2.01%
Expected volatility		67%-69%
Expected term		5.50 – 6.11 years

Summary of information on the Company's restricted stock

		Restricted Stock
		Number of Shares		Weighted Average Grant Date Fair Value
January 1, 2015		718,400		$	10.72
Granted		—		$	—
Vested		(361,919	)	$	10.60
Forfeited		(3,346	)	$	10.82
Unvested at June 30, 2015		353,135		$	10.85

Schedule of share-based compensation expense recorded in the statement of operations

		Three Months Ended June 30,						Six Months Ended June 30,
		2015			2014			2015			2014
Research and development		$	3,957		$	2,209		$	8,624		$	4,153
Selling, general and administrative		4,371			2,069			9,452			3,830
Total		$	8,328		$	4,278		$	18,076		$	7,983

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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