Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32,725	$ 12,950
Accounts receivable, net	5,097	4,041
Inventory	8,851	9,837
Prepaid expenses and other current assets	1,225	590
Total current assets	47,898	27,418
Property and equipment, net	3,457	3,946
Other assets	209	73
Total assets	51,564	31,437
Current liabilities:
Accounts payable	2,883	2,920
Accrued liabilities	6,339	3,748
Deferred income on shipments to distributors		1,720
Current portion of long-term debt	5,993	3,987
Total current liabilities	15,215	12,375
Long-term debt, net of current portion	5,366	8,178
Total liabilities	20,581	20,553
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2018 and December 31, 2017
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 16,800,505 and 12,817,201 shares issued and outstanding as of June 30, 2018 and December 31, 2017	2	1
Additional paid-in capital	155,866	128,422
Accumulated deficit	(124,885)	(117,539)
Total stockholders' equity	30,983	10,884
Total liabilities and stockholders' equity	$ 51,564	$ 31,437

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.