Going Concern	6 Months Ended
Jun. 30, 2018
Going Concern
Going Concern	2. Going Concern As of June 30, 2018, the Company had approximate balances of $1.7 million of cash and cash equivalents, $20.9 million of investments available-for-sale, working capital of $24.3 million and an accumulated deficit of $258.0 million. Net cash used in operating activities for the six months ended June 30, 2018 was approximately $9.8 million. The Company will require significant additional capital to sustain its short-term operations and make the investments it needs to execute its longer-term business plan. The Company’s existing liquidity is not sufficient to fund its operations and anticipated capital expenditures within the next 12 months. The Company intends to seek additional debt or equity financing; however, there are currently no commitments in place for further financing nor is there any assurance that such financing will be available to the Company on favorable terms, if at all. The Company’s recurring operating losses, net operating cash flow deficits, and an accumulated deficit, raise substantial doubt about the Company’s ability to continue as a going concern for one year from the issuance of the accompanying condensed consolidated financial statements. The condensed consolidated financial statements have been prepared assuming the Company will continue as a going concern. The Company has not made any adjustments to the accompanying condensed consolidated financial statements related to the recoverability and classification of recorded asset amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern.

2. Going Concern

As of June 30, 2018, the Company had approximate balances of $1.7 million of cash and cash equivalents, $20.9 million of investments available-for-sale, working capital of $24.3 million and an accumulated deficit of $258.0 million. Net cash used in operating activities for the six months ended June 30, 2018 was approximately $9.8 million.

The Company will require significant additional capital to sustain its short-term operations and make the investments it needs to execute its longer-term business plan. The Company’s existing liquidity is not sufficient to fund its operations and anticipated capital expenditures within the next 12 months. The Company intends to seek additional debt or equity financing; however, there are currently no commitments in place for further financing nor is there any assurance that such financing will be available to the Company on favorable terms, if at all.

The Company’s recurring operating losses, net operating cash flow deficits, and an accumulated deficit, raise substantial doubt about the Company’s ability to continue as a going concern for one year from the issuance of the accompanying condensed consolidated financial statements. The condensed consolidated financial statements have been prepared assuming the Company will continue as a going concern. The Company has not made any adjustments to the accompanying condensed consolidated financial statements related to the recoverability and classification of recorded asset amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern.