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Fixed assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fixed assets
Gross fixed assets	$ 38,356	$ 36,676
Less accumulated depreciation and amortization	(30,927)	(27,702)
Net fixed assets	7,429	8,974
Depreciation expense	3,290	2,876	$ 2,235
Leasehold improvements
Fixed assets
Gross fixed assets	14,038	14,029
Computer equipment and software
Fixed assets
Gross fixed assets	4,622	4,102
Furniture, fixtures, and lab equipment
Fixed assets
Gross fixed assets	19,343	17,443
Assets in process
Fixed assets
Gross fixed assets	$ 353	$ 1,102

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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