Subsequent event

6 Months Ended

Jun. 30, 2013

Subsequent Events [Abstract]

Subsequent event

15. Subsequent event

On July 16, 2013, the Company closed an underwritten public offering of 2,005,000 shares of its common stock at a price to the public of $35.00 per share. The Company sold 1,050,000 shares of its common stock, and certain selling stockholders, sold 955,000 shares of common stock in the offering. The proceeds to the Company, net of the underwriter’s fees were $34,530,250 before deducting estimated offering expenses of approximately $200,000 payable by the Company. The Company did not receive any proceeds from the sale of the shares by the selling stockholders. The Company used $25.0 million of the net proceeds to repay outstanding borrowings under the Company’s revolving line of credit.