Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Stock-based Compensation Expense Includes Amortization of Stock Options and Restricted Stock Units Granted

Stock-based compensation expense includes amortization of stock options and restricted stock units granted to employees and non-employees and has been reported in our Consolidated Statements of Operation and Comprehensive Loss as follows:

	For the Year Ended December 31,
(in thousands)	2017		2016
Research and development	$	2,256	$	2,693
Selling, general and administrative		2,628		1,116
Total stock-based compensation expense	$	4,884	$	3,809

Assumptions used in Valuing the Stock Options Granted under Black-Scholes Valuation Model

Aptevo utilizes the Black-Scholes valuation model for estimating the fair value of all stock options granted. Set forth below are the assumptions used in valuing the stock options granted:

	For the Year Ended December 31,
	2017	2016
Expected dividend yield	0.00%	0.00%
Expected volatility	75.00%	75.00%
Risk-free interest rate	1.90%	1.00%
Expected average life of options	6 years	3 years

Summary of Stock Option Activity

The following is a summary of option activity for the year ended December 31, 2017:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Term		Aggregate Intrinsic Value
Balance at December 31, 2016		2,085,214		$	2.57			$	164,767
Granted		1,071,189			2.11				—
Exercised		(204,275	)		4.15				334,268
Forfeited		(132,784	)		2.31				45,557
Outstanding at December 31, 2017		2,819,344		$	2.41		6.92	$	5,156,881
Exercisable at December 31, 2017		1,089,510		$	2.45		4.53	$	1,976,638

Summary of Restricted Stock Activity

The following is a summary of restricted stock activity for the year ended December 31, 2017:

	Number of Units			Weighted Average Fair Value per Unit		Aggregate Fair Value
Balance at December 31, 2016		3,034,195		$	2.88	$	7,406,256
Granted		19,803			2.00		37,118
Vested		(1,558,642	)		2.84		2,973,951
Forfeited		(283,869	)		2.94		597,483
Outstanding at December 31, 2017		1,211,487		$	2.91	$	5,136,705
Expected to Vest		1,174,656		$	2.91	$	4,980,541