Summary of significant accounting policies (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Marketable securities
Short-term marketable securities	$ 41,558,000	$ 0
Long-term marketable securities	0	0
Unrealized gains or losses from investments in marketable securities	0	0
Realized gains or losses from investments in marketable securities	0	0
Restricted cash
Short-term restricted cash related to letters of credit	30,000	465,000
Restricted cash classified as long-term	0	0
Business combinations
Transaction costs associated with business combinations	$ 50,000	$ 0
Total revenue \| Affiliated entities
Concentrations of credit risk
Concentration risk percentage	31.00%	18.00%
Total accounts receivable
Concentrations of credit risk
Number of customers	2	2
Number of groups of affiliated entities	3	1
Total accounts receivable \| One customer
Concentrations of credit risk
Concentration risk percentage		17.00%
Total accounts receivable \| Two customer
Concentrations of credit risk
Concentration risk percentage		12.00%
Total accounts receivable \| Affiliated entities
Concentrations of credit risk
Concentration risk percentage		23.00%
Total accounts receivable \| Affiliated entities group one
Concentrations of credit risk
Concentration risk percentage	26.00%
Total accounts receivable \| Affiliated entities group two
Concentrations of credit risk
Concentration risk percentage	16.00%
Total accounts receivable \| Affiliated entities group three
Concentrations of credit risk
Concentration risk percentage	10.00%

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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