Other Current Assets and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other current assets [Abstract]
Revenue recognized in excess of billings, net of reserves of $1,180 and $1,389, respectively	$ 8,740	$ 9,924
Other current assets	6	1,186
Total other current assets	8,746	11,110
Revenue recognized in excess of billings, reserves	1,180	1,389
Other current liabilities [Abstract]
Customer deposits	2,335	1,956
Acquisition obligations	179	267
Other liabilities	988	2,773
Total other current liabilities	$ 3,502	$ 4,996