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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

Net loss per share attributable to common stockholders - Stock repurchase (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Apr. 01, 2013
Stock repurchases
Remaining approved amount for repurchases	$ 5,180
Maximum
Stock repurchases
Amount of common stock approved by the entity for a stock repurchase program		$ 10,000