Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies

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Commitments and contingencies
6 Months Ended
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies
Commitments and contingencies
Letters of Credit
On January 28, 2016, the letter of credit from Enterprise Bank and Trust Company required for collateral with an outstanding performance bond was closed as the Company had met the performance obligations of the bond.