v3.3.1.900

Summary of significant accounting policies (Details 2) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) item | Dec. 31, 2013 USD ($) item
Marketable securities |  |  |
Short-term marketable securities | $ 0 | $ 1,614 |
Unrealized gains or losses in accumulated other comprehensive loss | 0 | 0 |
Business combinations |  |  |
Transaction costs associated with business combinations | $ 0 | $ 0 | $ 354
Total Revenue | Customer | Customer Group |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 17.00% | 15.00% |
Number of customer group | item | 1 | 1 | 2
Total Revenue | Customer | Customer Group One |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage |  |  | 14.00%
Total Revenue | Customer | Customer Group Two |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage |  |  | 14.00%
Total accounts receivable | Customer | Customer Group |  |  |
Concentrations of credit risk |  |  |
Number of customer group | item | 4 | 2 |
Total accounts receivable | Customer | Customer Group One |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 28.00% | 30.00% |
Total accounts receivable | Customer | Customer Group Two |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 19.00% | 17.00% |
Total accounts receivable | Customer | Customer Group Three |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 19.00% |  |
Total accounts receivable | Customer | Customer Group Four |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 10.00% |  |

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