Bitcoin lost nearly a fifth of its value over the weekend, raising concerns that investors are losing faith in the cryptocurrency.

Prices fell to a year-to-date low of $290.83 on Sunday, down over 18 percent from early Saturday, according to bitcoin news blog CoinDesk. Analysts are citing a number of factors for the decline: bearish chart signals; ongoing regulatory concerns; large sell orders by some early adopters; and a shift in the supply/demand balance.