Commitments and Contingencies	3 Months Ended
Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies In the normal course of business, the Company may be involved in legal proceedings or threatened legal proceedings. The Company is not party to any legal proceedings or aware of any threatened legal proceedings that are expected to have a material adverse effect on its financial condition, results of operations or liquidity. In February 2016, the Company signed a firm, non-cancelable, and unconditional commitment in an aggregate amount of $1,062,500 with a vendor to purchase certain inventory items, payable in minimum quarterly amounts of $62,500 through May 2020. At March 31, 2019, a balance of $278,000 remained outstanding under this purchase commitment. During the three months ended March 31, 2018 and 2019, total expense recorded in the Company’s unaudited condensed statements of operations and comprehensive loss for sales tax and maintenance obligations associated with equipment financing arrangements was approximately $29,000 and $24,000, respectively. At December 31, 2018 and March 31, 2019, approximately $69,000 and $78,000, respectively, of such sales tax and maintenance obligations incurred but not paid were recorded in accrued other liabilities in the Company’s balance sheet (see Note 5). Future payments totaling approximately $311,783 for sales tax and maintenance obligations associated with financed equipment were due under equipment financing arrangements at March 31, 2019, which will be expensed as incurred (see Note 7).

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

11. Commitments and Contingencies

In the normal course of business, the Company may be involved in legal proceedings or threatened legal proceedings. The Company is not party to any legal proceedings or aware of any threatened legal proceedings that are expected to have a material adverse effect on its financial condition, results of operations or liquidity.

In February 2016, the Company signed a firm, non-cancelable, and unconditional commitment in an aggregate amount of $1,062,500 with a vendor to purchase certain inventory items, payable in minimum quarterly amounts of $62,500 through May 2020. At March 31, 2019, a balance of $278,000 remained outstanding under this purchase commitment.

During the three months ended March 31, 2018 and 2019, total expense recorded in the Company’s unaudited condensed statements of operations and comprehensive loss for sales tax and maintenance obligations associated with equipment financing arrangements was approximately $29,000 and $24,000, respectively. At December 31, 2018 and March 31, 2019, approximately $69,000 and $78,000, respectively, of such sales tax and maintenance obligations incurred but not paid were recorded in accrued other liabilities in the Company’s balance sheet (see Note 5). Future payments totaling approximately $311,783 for sales tax and maintenance obligations associated with financed equipment were due under equipment financing arrangements at March 31, 2019, which will be expensed as incurred (see Note 7).