Loss Per Common Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Loss Per Common Share

11. Loss Per Common Share

The following table sets forth the computation of basic and diluted net loss per share: 

	Three Months Ended March 31,
(in thousands, except per share amounts)	2017			2016
Numerator:
Net loss attributable to Alliance HealthCare Services, Inc.	$	(614	)	$	(1,190	)
Denominator:
Weighted average shares — basic		10,973			10,779
Effect of dilutive securities:
Stock options and RSUs		—			—
Weighted average shares — diluted		10,973			10,779
Net loss per common share attributable to Alliance HealthCare    Services, Inc.:
Basic	$	(0.06	)	$	(0.11	)
Diluted	$	(0.06	)	$	(0.11	)
Stock options excluded from the computation of diluted per share    amounts:
Weighted average shares for which the exercise price exceeds    average market price of common stock		323			465
Average exercise price per share that exceeds average market    price of common stock	$	29.37		$	25.34